Prepare graham cracker crust by mixing ingredients. Pat into an 8 or 9 inch pie pan and bake at 375 degrees for 10 minutes. Remove from oven and cool.
To prepare filling, cream butter, sugar and cocoa until of a minimum of 5 minutes.
Scrape bowl often. Add each egg separately and beat for a full 5 minutes after each addition of each egg.
Scrape bowl often.
Pour into cooled pie crust and refrigerate.
Pipe whipped cream around edge and sprinkle with chopped nuts or chocolate curls.
May serve refrigerated or frozen.